SITE.su is an online marketplace for premium domain names, offering a catalog of more than 40,000 domains, primarily in the .ru, .su, and .рф zones. The service is designed for businesses and individuals seeking a distinctive web address for a website, brand, or personal project. Customers can browse available names, search by keywords or other parameters, view a full domain list, or download listings for review.

SITE.su offers both domain purchases and rentals. Purchases can be completed online, with the site describing transfer of domain administration rights as immediate. Rental arrangements allow customers to assign their own DNS servers and include a priority right to buy the domain during the rental period; the purchase price is set in the rental agreement. Rental terms can last up to 50 months. Domain listings include details such as price, registration age, and search-related indicators. The marketplace also provides a help section, contact options, and a form for questions or price offers.